Attack system on rabbits, no item drops yet

@PimV, @sagar193, @jhay 

needed to work around an crash, for some reason the killed rabbit isn't properly removed for the list.
That's why the respawn looks so odd.
Respawn methode? Nee, gewoon echt nee. Dat regelt de spawnpoint.
``` this->spawnPoint->decreaseChildren();  ``` is het enige wat je moet doen als de konijn dood gaat.